The coordination number for the Al3+ ion is typically between four and six. Use the anion coordination number to determine the Al3 + coordination number in the following compounds: (a) AlF3 where the fluoride ions are two coordinate.

Video transcript

Hello everybody in this video. We want to go ahead and predict the coordination number of our C three cr three plus carry on in our crp molecule and we're assuming that the phosphate ions are four coordinates. So in that case then we're gonna go ahead. Use this formula right here. So we have the numbers of Catalans per formula unit. So just put a few, the nominee will be the number of an ions per formula unit. And that's going to equal to the an ion coordination number over the cat ion coordination number. So, rearranging everything, we're gonna go ahead. I say for a cast iron coordination number to one side of the equation bar or the equal sign. So we have the new occasion being cat on coordination number equaling to the an ion coordination number multiplied by the number of an ions per formula unit. And on the denominator will have the number of cat ions per formula unit. So in our molecule of crp we have one can I? Um and one and I am and eliciting a problem, we have the ion and ion Coordination number will be equal to four right over here. So then the cat eye on coordination number is equal to four times 1/1, which simplifying will be four times one point 4/1, which will equal to just four. So the coordination number Of cr three plus is going to be equal to four. And it's going to be my final answer for this question. Hopefully this will help you. Thank you